Ignition shield disconnect



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V IGNITION SHIELD DISCONNECT Filed April 24, 1946 2 Sheets-Sheet 2 a R N i n l :Nr/Emmi.

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Patented Jan. 17, 1950 UNITED STATES PATENT oer-ICE 2,494,886 IGNITION SHIELD DISCONNECT Edward Medvetl, Carteret, N. J., alalgnor to Breeze Corporations, Ine.. Newark, N. J., a corporation of New Jersey Application April 24, 1846, Serial No. 884,878

lAClalm. (Cl. 17d-)1) This invention relates to a disconnect for a radio shielded ignition system such as is used to permit the spark plug wires of an internal combustion engine to be readily connected to or disconnected from the rest of the ignition system.

The disconnect member in a shielded ignition system presents a potential failure point to the It threatens an interruption in the continuous metallic covering of the ignition wires which would cause radio interference. It is also a point at which moisture may enter and thereby cause insulation failure.

The principal object of this invention, therefore, is to provide a disconnect which will be moistureproof and also a highly efficient radio.

shield.

A further object of this invention is a shielded disconnect which may be easily assembled and disassembled.

A feature of this invention is the small number .of parts required.

Another object of this invention is to provide a iiexible housing for the ignition wire within the disconnect to prevent the danger of breakage in described, illustrated and claimed:

In the accompanying drawings, forming part hereof, is illustrated one form of embodiment of the invention, in which drawings similar reference characters designate corresponding parts, and in which:

Figure 1 is a longitudinal section of a complete embodiment of the shielded disconnect as it appears in actual use.

Figure 2 is a vertical section on line 2-2 of Figure l. n

Figure 3 is a vertical section on line 3-3 of Figure 1.

Figure 4 is a longitudinal section of the rubber sleeve shown in Figure 1.

Referring to the drawings, and particularly to Figure l, I indicates a ilared manifold outlet such as is soldered to the manifold in the well known manner. A bushing II is soldered or otherwise attached to the end of the outlet Ill. Said bushing I I is provided with external threads I2 and an internal bore I3.

A rubber sleeve I4, shown in detail in Figure 4,

is inserted in the bore Il-in such manner that a rearward extension I5 thereof projects well within the manifold outlet I0. A rubber wall I8 integral with said sleeve and having a central bore I1 therein is spaced from the end of the sleeve opposite the outlet I0. The portion of the sleeve I4 which seats in the bushing bore Il is enlarged and accommodates an annular groove I8 which is used for a purpose hereinafter described. A central bore I8 completes the construction of the sleeve I4.

.The stranded ignition cable 28 is passed through the bore I8 in the sleeve Il. The insulation a is stripped from the end of the cable and the strands 2l divided, half being passed through each of two holes 23 in a metal terminal sleeve 22. (See Figure 2.) Both holes 28 lead into the sleeve bore 2l where the wires 2| are twisted together again. This holds the metal terminal sleeve 22 in firm contact with the rubber sleeve I4 and positioned within the socket 25 formed by the /bore of the rubber sleeve Il and the rubber wall I6.

The small end of a contact spring 26 is now forced over the outside diameter of the metal terminal sleeve 22 until the end turn of the spring 26 snaps into a groove 21 in the said sleeve. This secures the spring 26 in position.`

A dielectric sleeve 28 is next urged over the assembled rubber sleeve Il until its thinned edge 29 seats itself within the annular groove I8 in the said rubber sleeve Il. The outer metal shield 38 is slipped over the dielectric sleeve 28 and rotated. The shield 30 is internally threaded at Il and engages the thread I2 on the bushing Il as it is rotated. An external thread 32 is provided on the opposite end of the shield 30 for a `purpose which will be described below. An internal shoulder 33 machined in the shield 38 forces the dielectric sleeve 28 against the rubber sleeve Il and holds the said sleeve 28 in place. The rubber of the sleeve Il is also compressed by the attachment of the shield 30, thereby forming a sealed joint around the cable 20 and in the vicinity of the juncture of the shield 30 and bushing I I. (See Figure 3.)

The opposite terminal of the disconnect is assembled by slipping a coupling nut 34 over the shielded conduit 35 and soldering a ferrule 36 to the end of the conduit 35 in the well known way. The cable 2li is then stripped at its end to expose the strandedl ignition wire 2|. A. yielding rubber sleeve 81 is then passed over the cable. Said sleeve 31 has a wall 38 spaced from its end and identical in construction to the above-mentioned wall 3 il. A collar 4I formed "on the outer end of the sleeve Il completes its construction. The wire strands 2| are drawn through the bore in the wall Il and separated into two groups. The strands are next passed through the two holes in a button shaped metal terminal 3l. The wires are then twisted together to secure the terminal Il to the sleeve Il.

When the coupling nut 34 is rotated, it engages the external threads 92 ci the shield I0. This forces the rubber sleeve 2l forward within the dielectric sleeve 28 until the spring contact 28 bears against the metal terminal 29. completing the electrical connection. vThe shielding' connection is completed when the coupling nut 34 is tightened.y The rubber collar 40 is also compressed as the coupling nut 34 is tightened. This forms a sealed Joint around the cable 29 and at the Juncture of the ferrule 30 and shield 30.

By referring to Figure 4 itcan be seen that the rearward extension i5 of the rubber sleeve I4, which extends into the manifold outlet I0, is provided' with a collar 4| integral with said sleeve i4. The function of this collar 4| is to prevent the cable 20 from rubbing against the outlet ili'when inuse. It is apparent that such friction would result in a breakdown of the cable insulation and accesso A radio shielding electric disconnect comprising a exible dielectric sleeve to receive an suiated conductor, a shoulder and spaced rounding skirt formed on said sleeve, a second opposed dielectric sleeve to receive a second insu lated conductor. means intermediate of the saidv member on the opposite end of themetal sleeve A to force the ilexible parts together to insure a liqa consequent failure of the shielded ignition sysuid tight seal.

EDWARD MEDVE'I'Z.

REFERENCES crrnn The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date 1,896,444 n Fossati Feb. 7, 1933 2,181,860 Adkinson Dec. 5, 1939 2,278,448 Ingalls Apr. 1, 1942 2,351,543 Race June 13, 1944 2,420,138 Ingalls May 8, 1947 2,442,015 Peters May 25,1948 2,452,847 Frei -.7 Nov. 2, 1948 

